Reg Siger, that name made my braincells wakeup.
He wrote articles in Technote magazine, and created styles as well.
I can't tell you about the style used, but don't be surprised if it's a custom one.
Some stuff and words about him here at Carillon:
https://www.carillonstudios.com/reg-siger-software/
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)